7(6+3x)=-210

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Solution for 7(6+3x)=-210 equation: 


Simplifying
7(6 + 3x) = -210
(6 * 7 + 3x * 7) = -210
(42 + 21x) = -210

Solving
42 + 21x = -210

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-42' to each side of the equation.
42 + -42 + 21x = -210 + -42

Combine like terms: 42 + -42 = 0
0 + 21x = -210 + -42
21x = -210 + -42

Combine like terms: -210 + -42 = -252
21x = -252

Divide each side by '21'.
x = -12

Simplifying
x = -12

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